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Diffstat (limited to 'src/lib/auditor_api_exchanges.c')
| -rw-r--r-- | src/lib/auditor_api_exchanges.c | 245 |
1 files changed, 245 insertions, 0 deletions
diff --git a/src/lib/auditor_api_exchanges.c b/src/lib/auditor_api_exchanges.c new file mode 100644 index 000000000..770eedda3 --- /dev/null +++ b/src/lib/auditor_api_exchanges.c @@ -0,0 +1,245 @@ +/* + This file is part of TALER + Copyright (C) 2014-2018 GNUnet e.V. + + TALER is free software; you can redistribute it and/or modify it under the + terms of the GNU General Public License as published by the Free Software + Foundation; either version 3, or (at your option) any later version. + + TALER is distributed in the hope that it will be useful, but WITHOUT ANY + WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR + A PARTICULAR PURPOSE. See the GNU General Public License for more details. + + You should have received a copy of the GNU General Public License along with + TALER; see the file COPYING. If not, see + <http://www.gnu.org/licenses/> +*/ +/** + * @file auditor-lib/auditor_api_exchanges.c + * @brief Implementation of the /exchanges request of the auditor's HTTP API + * @author Christian Grothoff + */ +#include "platform.h" +#include <jansson.h> +#include <microhttpd.h> /* just for HTTP status codes */ +#include <gnunet/gnunet_util_lib.h> +#include <gnunet/gnunet_json_lib.h> +#include <gnunet/gnunet_curl_lib.h> +#include "taler_json_lib.h" +#include "taler_auditor_service.h" +#include "auditor_api_handle.h" +#include "taler_signatures.h" +#include "auditor_api_curl_defaults.h" + +/** + * How many exchanges do we allow a single auditor to + * audit at most? + */ +#define MAX_EXCHANGES 1024 + + +/** + * @brief A ListExchanges Handle + */ +struct TALER_AUDITOR_ListExchangesHandle +{ + + /** + * The connection to auditor this request handle will use + */ + struct TALER_AUDITOR_Handle *auditor; + + /** + * The url for this request. + */ + char *url; + + /** + * Handle for the request. + */ + struct GNUNET_CURL_Job *job; + + /** + * Function to call with the result. + */ + TALER_AUDITOR_ListExchangesResultCallback cb; + + /** + * Closure for @a cb. + */ + void *cb_cls; + +}; + + +/** + * Function called when we're done processing the + * HTTP /deposit-confirmation request. + * + * @param cls the `struct TALER_AUDITOR_ListExchangesHandle` + * @param response_code HTTP response code, 0 on error + * @param djson parsed JSON result, NULL on error + */ +static void +handle_exchanges_finished (void *cls, + long response_code, + const void *djson) +{ + const json_t *json = djson; + const json_t *ja; + unsigned int ja_len; + struct TALER_AUDITOR_ListExchangesHandle *leh = cls; + + leh->job = NULL; + switch (response_code) + { + case 0: + break; + case MHD_HTTP_OK: + ja = json_object_get (json, + "exchanges"); + if ( (NULL == ja) || + (! json_is_array (ja)) ) + { + GNUNET_break (0); + response_code = 0; + break; + } + + ja_len = json_array_size (ja); + if (ja_len > MAX_EXCHANGES) + { + GNUNET_break (0); + response_code = 0; + break; + } + { + struct TALER_AUDITOR_ExchangeInfo ei[ja_len]; + int ok; + + ok = GNUNET_YES; + for (unsigned int i=0;i<ja_len;i++) + { + struct GNUNET_JSON_Specification spec[] = { + GNUNET_JSON_spec_fixed_auto ("master_pub", &ei[i].master_pub), + GNUNET_JSON_spec_string ("exchange_url", &ei[i].exchange_url), + GNUNET_JSON_spec_end() + }; + + if (GNUNET_OK != + GNUNET_JSON_parse (json_array_get (ja, + i), + spec, + NULL, NULL)) + { + GNUNET_break_op (0); + ok = GNUNET_NO; + break; + } + } + if (GNUNET_YES != ok) + break; + leh->cb (leh->cb_cls, + response_code, + TALER_EC_NONE, + ja_len, + ei, + json); + leh->cb = NULL; + } + break; + case MHD_HTTP_BAD_REQUEST: + /* This should never happen, either us or the auditor is buggy + (or API version conflict); just pass JSON reply to the application */ + break; + case MHD_HTTP_NOT_FOUND: + /* Nothing really to verify, this should never + happen, we should pass the JSON reply to the application */ + break; + case MHD_HTTP_INTERNAL_SERVER_ERROR: + /* Server had an internal issue; we should retry, but this API + leaves this to the application */ + break; + default: + /* unexpected response code */ + GNUNET_log (GNUNET_ERROR_TYPE_ERROR, + "Unexpected response code %u\n", + (unsigned int) response_code); + GNUNET_break (0); + response_code = 0; + break; + } + if (NULL != leh->cb) + leh->cb (leh->cb_cls, + response_code, + TALER_JSON_get_error_code (json), + 0, + NULL, + json); + TALER_AUDITOR_list_exchanges_cancel (leh); +} + + +/** + * Submit an /exchanges request to the auditor and get the + * auditor's response. If the auditor's reply is not + * well-formed, we return an HTTP status code of zero to @a cb. + * + * @param auditor the auditor handle; the auditor must be ready to operate + * @param cb the callback to call when a reply for this request is available + * @param cb_cls closure for the above callback + * @return a handle for this request; NULL if the inputs are invalid (i.e. + * signatures fail to verify). In this case, the callback is not called. + */ +struct TALER_AUDITOR_ListExchangesHandle * +TALER_AUDITOR_list_exchanges (struct TALER_AUDITOR_Handle *auditor, + TALER_AUDITOR_ListExchangesResultCallback cb, + void *cb_cls) +{ + struct TALER_AUDITOR_ListExchangesHandle *leh; + struct GNUNET_CURL_Context *ctx; + CURL *eh; + + GNUNET_assert (GNUNET_YES == + MAH_handle_is_ready (auditor)); + + leh = GNUNET_new (struct TALER_AUDITOR_ListExchangesHandle); + leh->auditor = auditor; + leh->cb = cb; + leh->cb_cls = cb_cls; + leh->url = MAH_path_to_url (auditor, "/exchanges"); + + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, + "URL for list-exchanges: `%s'\n", + leh->url); + eh = TAL_curl_easy_get (leh->url); + ctx = MAH_handle_to_context (auditor); + leh->job = GNUNET_CURL_job_add (ctx, + eh, + GNUNET_NO, + &handle_exchanges_finished, + leh); + return leh; +} + + +/** + * Cancel a deposit-confirmation permission request. This function cannot be used + * on a request handle if a response is already served for it. + * + * @param deposit-confirmation the deposit-confirmation permission request handle + */ +void +TALER_AUDITOR_list_exchanges_cancel (struct TALER_AUDITOR_ListExchangesHandle *leh) +{ + if (NULL != leh->job) + { + GNUNET_CURL_job_cancel (leh->job); + leh->job = NULL; + } + GNUNET_free (leh->url); + GNUNET_free (leh); +} + + +/* end of auditor_api_exchanges.c */ |